建Oracle主鍵自增序列

CREATE SEQUENCE CMPO_PUSH_SEQ 
MINVALUE 1       
NOMAXVALUE      
START WITH 1   
INCREMENT BY 1  
NOCYCLE          
NOCACHE;     

CREATE OR REPLACE TRIGGER CMPO_PUSH_TRIGGER BEFORE INSERT ON CMPO_PUSH FOR EACH ROW WHEN(NEW.PUSH_ROW_ID IS NULL)
BEGIN 
        SELECT CMPO_PUSH_SEQ.NEXTVAL INTO:NEW.PUSH_ROW_ID FROM dual;
END;

建Oracle主鍵自增序列，沒錯插入自增1